Systems and methods for high-throughput recording of holographic gratings in waveguide cells

• US 10,732,569 B2
• Filed: 08/29/2018
• Issued: 08/04/2020
• Est. Priority Date: 01/08/2018
• Status: Active Grant

• Current Assignee: DigiLens Inc
• Original Assignee: DigiLens Inc
• Inventors: Waldern, Jonathan David, Grant, Alastair John, Popovich, Milan Momcilo, Morad, Ratson, Williams, Sean Michael
• Primary Examiner(s): Beatty, Collin X
• Application Number:
  US16/116,834
• Publication Number:
  US 20190212698A1
• Time in Patent Office: 706 Days
• Field of Search: 359 10
• CPC Class Codes: G02B 2006/12107 Grating
• CPC Class Codes: G02B 27/0172 characterised by optical features
• CPC Class Codes: G02B 6/138 by using polymerisation
• CPC Class Codes: G02B 6/4204 the coupling comprising intermediate optical elements, e.g. lenses, holograms encapsulated active devices H01S5/02208, H01L33/52
• CPC Class Codes: G02F 1/13342 Holographic polymer dispersed liquid crystals
• CPC Class Codes: G03H 1/0248 Volume holograms
• CPC Class Codes: G03H 1/0408 Total internal reflection [TIR] holograms, e.g. edge lit or substrate mode holograms
• CPC Class Codes: G03H 1/0465 Particular recording light; Beam shape or geometry G03H1/06 takes precedence
• CPC Class Codes: G03H 1/30 discrete holograms only
• CPC Class Codes: G03H 2001/0434 In situ recording when the hologram is recorded within the device used for reconstruction
• CPC Class Codes: G03H 2001/0439 for recording Holographic Optical Element [HOE] HOE per se G02B5/32
• CPC Class Codes: G03H 2222/34 Multiple light sources
• CPC Class Codes: G03H 2223/16 Optical waveguide, e.g. optical fibre, rod
• CPC Class Codes: G03H 2223/24 Reflector; Mirror
• CPC Class Codes: G03H 2223/50 Particular location or purpose of optical element downstream optical component G03H1/2205
• CPC Class Codes: G03H 2227/03 Means for moving one component G03H1/0476, G03H2001/2695 take precedence
• CPC Class Codes: G03H 2227/04 Production line for mass production
• CPC Class Codes: G03H 2227/05 Support holding the holographic record

Abstract

Holographic volume gratings in waveguide cells can be recorded using many different methods and systems in accordance with various embodiments of the invention. One embodiment includes a holographic recording system including at least one laser source configured to emit recording beams and a movable platform configured to move between a first position and a second position, wherein when the movable platform is in the first position, the at least one laser source is configured to emit a first set of one or more recording beams toward a first set of one or more stations and when the movable platform is in the second position, the at least one laser source is configured to emit a second set of one or more recording beams toward a second set of one or more stations.

Claims

1. A holographic recording system comprising;

at least one laser source configured to emit recording beams;

a first set of one or more stations configured to house a first set of waveguide cells, wherein the first set of one or more stations comprises a first station and a second station;

a second set of one or more stations configured to house a second set of waveguide cells; and

a movable platform configured to move between a first position and a second position, wherein;

when the movable platform is in the first position, the at least one laser source is configured to emit a first set of one or more recording beams toward the first set of one or more stations, wherein the first set of one or more recording beams comprises a first recording beam and a second recording beam;

when the movable platform is in the first position, the at least one laser source is configured to emit the first recording beam toward the first station and the second recording beam toward the second station; and

when the movable platform is in the second position, the at least one laser source is configured to emit a second set of one or more recording beams toward the second set of one or more stations.

2. The holographic recording system of claim 1, further comprising a plurality of mirrors, wherein when the movable platform is in the first position, the at least one laser source is configured to emit the first set of one or more recording beams toward the first set of one or more stations by using the plurality of mirrors to direct the first set of one or more recording beams.

3. The holographic recording system of claim 1, wherein:

the at least one laser source comprises a first laser source and a second laser source; and

when the movable platform is in the first position, the first laser source is configured to emit the first recording beam toward the first set of one or more stations and the second laser source is configured to emit the second recording beam toward the first set of one or more stations.

4. The holographic recording system of claim 1, further comprising a beamsplitter, wherein the at least one laser source is configured to emit the first and second recording beams by emitting an initial beam toward the beamsplitter.

5. The holographic recording system of claim 1, further comprising a beamsplitter mounted on the movable platform, wherein when the movable platform is in the first position, the at least one laser source is configured to emit the first and second recording beams by emitting an initial beam toward the beamsplitter.

6. The holographic recording system of claim 1, further comprising a pair of beamsplitters mounted on the movable platform and a stationary beamsplitter, wherein:

the first set of one or more recording beams further comprises third and fourth recording beams; and

when the movable platform is in the first position, the at least one laser source is configured to emit the third recording beam toward the first station and to emit the fourth recording beam toward the second station, wherein the first, second, third, and fourth recording beams are formed using the pair of beamsplitters and the stationary beamsplitter.

7. The holographic recording system of claim 1, wherein each of the stations within the first and second sets of stations comprises an optical filter for filtering out ambient light.

8. A method for recording volume gratings, the method comprising:

emitting a first set of one or more recording beams using at least one laser source, wherein the first set of one or more recording beams comprises a first recording beam and a second recording beam;

directing the emitted first set of one or more recording beams toward a first set of one or more waveguide cells housed in a first set of one or more stations using at least one optical component mounted on a movable platform, wherein the first set of one or more waveguide cells comprises a first waveguide cell and a second waveguide cell, wherein the emitted first recording beam is directed toward the first waveguide cell and the emitted second recording beam is directed toward the second waveguide cell;

recording a first set of one or more volume gratings in the first set of one or more waveguide cells;

repositioning the movable platform;

emitting a second set of one or more recording beams using the at least one laser source;

directing the emitted second set of one or more recording beams toward a second set of one or more waveguide cells housed in a second set of one or more stations using the at least one optical component mounted on the movable platform; and

recording a second set of one or more volume gratings in the second set of one or more waveguide cells.

9. The method of claim 8, wherein:

the at least one laser source comprises a first laser source and a second laser source; and

the first recording beam is emitted by the first laser source and the second recording beam is emitted by the second laser source.

10. The method of claim 8, wherein the first and second recording beams are formed by emitting an initial beam toward a beamsplitter.

11. The method of claim 8, wherein the first and second recording beams are formed by emitting an initial beam toward a beamsplitter mounted on the movable platform.

12. The method of claim 8, wherein:

the at least one optical component comprises a first mounted beamsplitter and a second mounted beamsplitter;

the first set of one or more recording beams is emitted using at least one laser source by;

emitting an initial recording beam toward a stationary beamsplitter to form the first recording beam and the second recording beam;

directing the first recording beam toward the first mounted beamsplitter to form a first recording sub-beam and a second recording sub-beam; and

directing the second recording beam toward the second mounted beamsplitter to form a third recording sub-beam and a fourth recording sub-beam; and

the emitted first set of one or more recording beams is directed toward the first set of one or more waveguide cells by;

directing the first and third recording sub-beams toward the first waveguide cell; and

directing the second and fourth recording sub-beams toward the second waveguide cell.

13. The method of claim 8, wherein the first set of one or more volume gratings is recorded using a single beam interference process.

14. A holographic recording system comprising:

a laser source;

first, second, third, and fourth stations, wherein each station comprises an exposure stack and a waveguide cell stage, wherein the waveguide cell stage is configured to;

house a waveguide cell;

position the waveguide cell such that a surface of the waveguide cell is parallel to a surface of the exposure stack; and

maintain the position of the waveguide cell while accounting for micro-movements;

a pair of stationary beamsplitters;

a movable platform mounted on a track, wherein the movable platform is configured to move along the track between a first position and a second position;

three beamsplitters mounted on the movable platform, wherein;

when the movable platform is in the first position, the laser source is configured to;

emit a first set of six recording sub-beams simultaneously by;

emitting a first initial recording beam toward the pair of stationary beamsplitters to form a first set of three recording beams; and

directing the first set of three recording beams toward the three mounted beamsplitters to form the first set of six recording sub-beams;

direct three recording sub-beams within the first set of the six recording sub-beams toward the first station; and

direct the other three recording sub-beams within the first set of six recording sub-beams toward the second station; and

when the movable platform is in the second position, the laser source is configured to;

emit a second set of six recording sub-beams simultaneously by;

emitting a second initial recording beam toward the pair of stationary beamsplitters to form a second set of three recording beams; and

directing the second set of three recording beams toward the three mounted beamsplitters to form the second set of six recording sub-beams;

direct three recording sub-beams within the second set of the six recording sub-beams toward the third station; and

direct the other three recording sub-beams within the second set of six recording sub-beams toward the fourth station.